/*
 * Copyright 2006 Berry Crawford
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.judo.service;

import java.util.HashMap;

public class ServiceManager
{
	private static HashMap services = new HashMap();
	
	public static void defineService(String name,JudoService service)
	{
		services.put(name,service);
	}
	
	public static JudoService locateService(String serviceName,Class type)
		throws ServiceNotFoundException, IncorectServiceTypeException
	{
		if (services.containsKey(serviceName))
		{
			JudoService service = (JudoService)services.get(serviceName);
			
			if (type.isAssignableFrom(service.getClass()))
				return service;
			else
				throw new IncorectServiceTypeException(
						"The service '"+serviceName+"' in the component is defined as type '"+type.getCanonicalName()+"' but the service manager has the type as '"+service.getClass().getCanonicalName()+"'.  There types must be assignable.");
		}
		else
		{
			throw new ServiceNotFoundException(
					"Service not found: "+serviceName);
		}
	}
}
